How to disable double-tap zoom on Safari mobile?

How can double-tap zoom be disabled on Safari mobile?

There are some rules for default behaviour: With text it somehow depends on font-size. Other types of elements also allow to be double tapped and usually perform a zoom then (e. g. img).

But the entire double-tap zoom should be disabled.

These were common approaches:

• Applying touch-action: manipulation to *; does not work at all.
• Applying touch-action: none to *; seems to disable zooming back out from the zoomed-in position…
• <meta name="viewport" ...>; the browser ignores it.
• Then, there were some JavaScript/jQuery solutions but none seemed to work at all or work reliably.

document.ondblclick = function (e) {
    e.preventDefault();
}

That's literally it. No special tricks needed lol. Tested on Safari iOS.